A method for producing granules that contain at least one active ingredient and are stable at ambient temperature, includes successively: (1) preparing a matrix free of an active ingredient by mixing, without the addition of water, an encapsulation vehicle for the active ingredient and a non-aqueous plasticiser compatible with the vehicle and the active ingredient, the encapsulation vehicle and the plasticiser being present in amounts that give the matrix a glass transition temperature higher than the ambient temperature； (2) heating the matrix in an extruder to an extrusion temperature to produce an amorphous melt matrix； (3) injecting the active ingredient into the melt matrix； (4) extruding the melt mass including the active ingredient through a die and cutting granules at an exit point of the die.
